PCI-T32-XP-N2 Lattice, PCI-T32-XP-N2 Datasheet - Page 47

• Manufacturer Part Number: PCI-T32-XP-N2
• Description: FPGA - Field Programmable Gate Array PCI Target 32B
• Manufacturer: Lattice

Specifications of PCI-T32-XP-N2

• Factory Pack Quantity: 1

Lattice Semiconductor
Table 2-17. 32-bit Master Read Transaction with Local Wait State
IPUG18_09.2, November 2010
Figure 2-13. 32-bit Master Read Transaction with Local Wait State
CLK
1
2
3
4
5
lm_burst_length[11:0]
lm_termination[2:0]
lm_burst_cnt[12:0]
lm_cben_in[3:0]
l_data_out[31:0]
lm_status[3:0]
lm_data_xfern
l_ad_in[31:0]
lm_req32n
cben[3:0]
ad[31:0]
lm_gntn
lm_rdyn
devseln
framen
trdyn
PCI Data
irdyn
reqn
gntn
par
clk
Phase
Idle
Idle
Idle
Idle
Idle
1
The lm_req32n signal is asserted on the Local Master interface, by the local master to request a
32-bit data transaction. The local master issues the PCI starting address, the bus command and
the burst length during the same clock cycle, to l_ad_in, lm_cben_in, and lm_burst_length,
respectively.
The master detects the asserted lm_req32n and asserts reqn to request the use of PCI bus.
gntn is asserted to grant the Core access to the PCI bus. Core is now the PCI master.
Since gntn is asserted and the current bus is idle, the Core starts the bus transactions. The Core
asserts lm_gntn to inform the local master that the bus request is granted.
If both lm_req32n and gntn were asserted on the previous cycle, lm_status[3:0] is changed
to ‘Address Loading’ to indicate the starting address, the bus command, and the burst length are
being latched.
2
Termination
Bus
3
Bus Length
Command
Don’t care
Address
( = 3 )
Bus
4
Don’t care
5
Don’t care
Don’t care
Address
Loading
6
Don’t care
Don’t care
Command
Address
47
Bus
7
Bus Length
Address
( = 3 )
Parity
Description
8
Byte Enable 1
Data 1
Transaction
9
Bus
Byte Enable 1
Parity 1
Data 2
Data 1
Data
2
Don’t care
Don’t care
10
Parity 2
Data
Functional Description
11
Data 3
Data 2
1
PCI IP Core User’s Guide
Data Parity 3
12
Don’t care
Data 3
Termination
Termination
13
Normal
Bus
0
Don’t care
14